impedence questions.

hello, i own an swr jr. which is 8 ohms, and i own a S.O.B. witch is also 8 ohms, but now i found a great trade in deal on a big bertha. The only problem is that the swr jr. is 8 ohms and the bertha is 4 ohms. the mimimun load on a swr 350 is 2 ohms, could i make this work or would i have to trade my 8 ohm jr. for a 4 ohm one. to make 2 ohms? thanks a bunch
-chris